Gree XK86 Owner's Manual page 37

Wired Controller (XK86 and XE76-33/H)
NOTES:
① Different models have different operating modes. Wired controller will select
the types of mode automatically according to the models of indoor units.
② Only the master indoor unit in the master-slave mode can set up Auto mode
(not applicable to heat recovery units).
③ Instructions on mode switch:
a) For heat recovery units, any one indoor unit can switch to different modes
freely;
b) For multi-functional residential multi VRF units, if only one indoor unit has
been turned on, this unit can switch to any mode; if multiple indoor units
have been turned on, system mode will be the mode of the unit that is
first turned on and other units cannot switch to a mode that is in conflict
with system mode.
c) For other types of indoor unit, when the system mode priority is the
master-slave mode, the operation mode of the system is basing on that
of master indoor unit. Master indoor unit can switch to any modes, while
slave unit can't switch to the mode that is conflicting with master indoor
unit. When master indoor unit changes mode which cause operation
mode of slave indoor unit conflicts with that of system, the operation
mode of slave unit will switch to the operate mode of system
automatically.
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